Corpus callosum abnormalities in psychopathic antisocial individuals may reflect atypical neurodevelopmental processes involving an arrest of early axonal pruning or increased white matter myelination. These findings may help explain affective deficits and previous findings of abnormal interhemispheric transfer in psychopathic individuals.
Degree of lateral preference (mixed versus consistent), family history of parental left-handedness, and presence of posttraumatic stress disorder (PTSD) were measured in 118 right-handed male U.S. combat veterans. Right-handed participants with mixed lateral preference were more likely to have PTSD than were right-handers with consistent lateral preference. Respondents reporting a left-handed parent were also more likely to have PTSD. Finally, there was a significant difference in the proportion of participants with PTSD for three groups: participants with parental left-handedness and mixed lateral preference (100% PTSD), participants with parental left-handedness or mixed lateral preference (70% PTSD), and participants with neither parental left-handedness nor mixed lateral preference (44% PTSD). These findings suggest the possible usefulness of further examining the relationship between mixed lateral preference, parental left-handedness, and other possible indicators of risk for PTSD.
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